Secagem por aspersão (spray drying) de extratos vegetais: bases e aplicações

Oliveira, Olivia Werner; Petrovick, Pedro Ros

doi:10.1590/s0102-695x2010000400026

Cited by 83 publications

(67 citation statements)

References 24 publications

(22 reference statements)

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“…The powder was screened (200 mesh) for grain size calibration and stored at ambient temperature protected from light (Oliveira & Petrovick, 2010).…”

Section: Study Materialsmentioning

confidence: 99%

<b>Cashew nut shell liquid and formulation: toxicity during the germination of lettuce, tomato seeds and coffee senna and seedling formation

et al. 2017

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ABSTRACT. Cashew (Anacardium occidentale) nut shell liquid (CNSL) has been successfully used in trials as an Aedes aegypti larvicide, but little is known about its environmental effects. In this study, the potential effects of CNSL and a CNSL-based phyto-product formulation on the germination and growth of Lactuca sativa (lettuce), Lycopersicon esculentum (tomato) and Senna obtusifolia (coffee senna) were assessed. The pH of CNSL and the formulation were 6.4 and 6.8, respectively; the electrical conductivities were 2.89 μS cm -1 (CNSL) and 2.21 μS cm -1 (formulation), respectively, and both contained anacardic acid (53.2%) and degradation products. In bioassays for germination and growth, CNSL (25, 50, 100, 150, and 200 mg mL -1 ), the formulation (100 mg mL -1 ) and the control were used in a completely randomized design. The results demonstrated the chemical effects of CNSL, which negatively affected the germination and vigor of lettuce and tomato and the vigor of coffee senna; for growth, it negatively influenced both the root and aerial parts of lettuce and tomato, but only the roots of coffee senna. The formulation had negative effects on the vigor of coffee senna and the growth of tomato and lettuce seedlings (roots and aerial parts). The results indicate the phytotoxicity of CNSL and the formulation for the plant species tested.Keywords: Anacardiaceae, Anacardium occidentale, CNSL, anacardic acid, allelopathy.Líquido da casca da castanha de caju e formulação: toxicidade sobre sementes de alface, tomate e fedegoso e formação de plântulas RESUMO. O líquido da casca da castanha de caju (LCC) de Anacardium occidentale está sendo utilizado com sucesso em ensaios larvicidas para Aedes aegypti; porém pouco se sabe sobre seus efeitos ambientais. Neste trabalho, o objetivo foi avaliar os efeitos do LCC e de um fitoproduto a base de LCC na germinação e no crescimento de Lactuca sativa (alface), Lycopersicon esculentum (tomate) e Senna obtusifolia (fedegoso). O pH do LCC e formulação é 6,4 e 6,8, respectivamente; a condutividade elétrica 2,89 μS cm -1 (LCC) e 2,21 μS cm -1 (formulação) e ambos contêm ácido anacárdico (53,2%) e produtos de degradação. Nos bioensaios de germinação e de crescimento, utilizou-se LCC (25, 50, 100, 150 e 200 mg mL -1 ) e a formulação (100 mg mL -1 ) e controle, com delineamento inteiramente casualizado. Os resultados demonstraram efeito do LCC, afetando negativamente a germinação e vigor da alface e tomate e o vigor do fedegoso; no crescimento, influenciou negativamente o crescimento da raiz e caule de alface e tomate e no fedegoso, apenas da raiz. A formulação exerceu efeito negativo apenas para sementes de fedegoso e afetou negativamente o crescimento das plântulas de alface e tomate, raiz e parte aérea. Os resultados obtidos indicaram fitotoxicidade do LCC e da formulação para as espécies testadas.

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“…The powder was screened (200 mesh) for grain size calibration and stored at ambient temperature protected from light (Oliveira & Petrovick, 2010).…”

Section: Study Materialsmentioning

confidence: 99%

<b>Cashew nut shell liquid and formulation: toxicity during the germination of lettuce, tomato seeds and coffee senna and seedling formation

et al. 2017

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“…Os grandes aglomerados não foram considerados no cálculo do diâmetro. Segundo a literatura, o material submetido a este processo de secagem tende a ter o diâmetro da gotícula produzida pelo atomizador [30] . A Figura 4 mostra a obtenção de nanofibras de celulose, confirmando os resultados obtidos no ensaio de MEV.…”

Section: Comparando a Figura 3a (Antes Fibrilação) E A Figura 3bunclassified

“…Estas gotículas entram em contato com uma corrente de ar aquecido, havendo transferência de calor e massa para evaporação do solvente. Com o aumento da área superficial, o solvente que envolve a partícula evapora rapidamente e o líquido interno desta difunde-se para a sua superfície, secando-a e formando partículas sólidas [29,30] . Alguns parâmetros de operação que influenciam no processo são: temperatura do ar de entrada, fluxo de entrada do material, taxa de evaporação do líquido e separação das partículas secas do gás [26,29] .…”

Section: Introductionunclassified

Obtenção de espumas flexíveis de poliuretano com celulose de Pinus elliottii

et al. 2017

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ResumoNeste trabalho foram desenvolvidas espumas flexíveis de poliuretano com a adição de celulose de Pinus nas concentrações de 0,5; 1 e 2% (m/m). A celulose foi submetida ao processo de fibrilação mecânica e posterior secagem por aspersão (spray dry) sendo caracterizada quanto a sua morfologia por MEV e MET. As espumas foram produzidas pelo método de batelada (one-shot) com a adição e mistura da fibra junto ao poliol. As espumas foram caracterizadas por MEV, densidade aparente e resistência à compressão. Os principais resultados indicam que a fibrilação mecânica promove a obtenção de fibras em escala nanométrica, porém durante a secagem, ocorre aglomeração ocasionando aumento para escala micrométrica. As propriedades mecânicas da espuma obtiveram acréscimos de 40 e 50% na resistência à compressão com a adição de 0,5 e 1% de celulose, respectivamente, evidenciando seu potencial como aditivo alternativo para o desenvolvimento de espumas de poliuretano. Palavras-chave: celulose, espuma, fibrilação, poliuretano, spray dry. AbstractIn this work, flexible polyurethane foams were developed with the addition of Pinus cellulose at concentrations of 0.5; 1 and 2 wt%. The cellulose was subjected to mechanical fibrillation process and subsequent dried by spray dry process. It was characterized morphologically by SEM and TEM. The foams were produced by one-shot method by adding and mixing the fiber with the polyol. The foams were characterized by SEM, apparent density and compression strength. The main results indicate that the mechanical fibrillation promotes the obtainment of nanoscale fibers, but during the drying process, agglomeration occurs causing an increase reaching the micrometer scale. The mechanical properties of the foam increased by 40 and 50% in compressive strength with the addition of 0.5% and 1% of cellulose, respectively, showing its potential as an alternative additive for the development of polyurethane foams.

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“…The use of dry extracts in the production of herbal medicines has been employed due to their greater chemical stability; physiochemical and microbiological characteristics; higher concentrations of active compounds; ease of patterning and handling; and greater processing capacity in different pharmaceutical formulations than liquid extracts [19,20].…”

Section: Introductionmentioning

confidence: 99%

Standardization and Stability Evaluation of Dry Extracts of Myracrodruon Urundeuva Allemão Obtained by Spray Drier

Leite

Souza

Oliveira

et al. 2017

Int J Pharm Pharm Sci

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Objective: This study aimed to obtain standardised dry extracts of Miracrodruon urundeuva Allemão using spray-dryer and evaluate the stability of the extracts. Methods:It evaluated the drying parameters: Proportion of colloidal silicon dioxide (CSD) (10, 15 and 20%), inlet temperature (160, 170 and 180 °C) and feed rate (4, 6 and 8 ml/min). The study of the accelerated stability of dry extract occurred in temperature of 40 °C (±2 °C) and relative humidity of 75% (±5%) for 6 mo. The anti-inflammatory activity of the dry extract was evaluated in Swiss mice by the paw edema method. Results:Variations in drying conditions did not represent significant variations in yields of the process. The drying temperature and feed rate significantly influenced the concentration of quercetin (p≤0.05). The increase in inlet temperature and feed flow promoted the increase of quercetin concentration in the extracts. The stability study showed that the concentration of quercetin in dry extract was stable over a period of 6 mo. The dry extract showed anti-inflammatory activity in mice orally. Conclusion:A condition of 10% of colloidal silicon dioxide with an 180 °C inlet temperature and a feed rate of 8 ml/min was considered the most adequate for obtaining the extracts and the drying process resulted in stable dry extracts and the quercetin was a suitable biomarker for monitoring the process.

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Secagem por aspersão (spray drying) de extratos vegetais: bases e aplicações

Cited by 83 publications

References 24 publications

<b>Cashew nut shell liquid and formulation: toxicity during the germination of lettuce, tomato seeds and coffee senna and seedling formation

<b>Cashew nut shell liquid and formulation: toxicity during the germination of lettuce, tomato seeds and coffee senna and seedling formation

Obtenção de espumas flexíveis de poliuretano com celulose de Pinus elliottii

Standardization and Stability Evaluation of Dry Extracts of Myracrodruon Urundeuva Allemão Obtained by Spray Drier

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